flash: prefix error codes with FL_

Prefix the flash status codes (ERR_*) with FL_ in order to avoid clashes
with third-party libraries. Case in point: including the lwIP library
header file <lwip/err.h> which defines err_enum_t as an enum with values
being ERR_*.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>
diff --git a/common/flash.c b/common/flash.c
index 24ddc8b..a64e51a 100644
--- a/common/flash.c
+++ b/common/flash.c
@@ -110,13 +110,13 @@
  * Make sure all target addresses are within Flash bounds,
  * and no protected sectors are hit.
  * Returns:
- * ERR_OK          0 - OK
- * ERR_TIMEOUT     1 - write timeout
- * ERR_NOT_ERASED  2 - Flash not erased
- * ERR_PROTECTED   4 - target range includes protected sectors
- * ERR_INVAL       8 - target address not in Flash memory
- * ERR_ALIGN       16 - target address not aligned on boundary
- *			(only some targets require alignment)
+ * FL_ERR_OK          0 - OK
+ * FL_ERR_TIMEOUT     1 - write timeout
+ * FL_ERR_NOT_ERASED  2 - Flash not erased
+ * FL_ERR_PROTECTED   4 - target range includes protected sectors
+ * FL_ERR_INVAL       8 - target address not in Flash memory
+ * FL_ERR_ALIGN       16 - target address not aligned on boundary
+ *			   (only some targets require alignment)
  */
 int
 flash_write(char *src, ulong addr, ulong cnt)
@@ -131,11 +131,11 @@
 	__maybe_unused ulong cnt_orig = cnt;
 
 	if (cnt == 0) {
-		return (ERR_OK);
+		return (FL_ERR_OK);
 	}
 
 	if (!info_first || !info_last) {
-		return (ERR_INVAL);
+		return (FL_ERR_INVAL);
 	}
 
 	for (info = info_first; info <= info_last; ++info) {
@@ -146,7 +146,7 @@
 
 			if ((end >= info->start[i]) && (addr < e_addr) &&
 			    (info->protect[i] != 0) ) {
-				return (ERR_PROTECTED);
+				return (FL_ERR_PROTECTED);
 			}
 		}
 	}
@@ -169,11 +169,11 @@
 #if defined(CONFIG_FLASH_VERIFY)
 	if (memcmp(src_orig, addr_orig, cnt_orig)) {
 		printf("\nVerify failed!\n");
-		return ERR_PROG_ERROR;
+		return FL_ERR_PROG_ERROR;
 	}
 #endif /* CONFIG_SYS_FLASH_VERIFY_AFTER_WRITE */
 
-	return (ERR_OK);
+	return (FL_ERR_OK);
 }
 
 /*-----------------------------------------------------------------------
@@ -182,33 +182,33 @@
 void flash_perror(int err)
 {
 	switch (err) {
-	case ERR_OK:
+	case FL_ERR_OK:
 		break;
-	case ERR_TIMEOUT:
+	case FL_ERR_TIMEOUT:
 		puts ("Timeout writing to Flash\n");
 		break;
-	case ERR_NOT_ERASED:
+	case FL_ERR_NOT_ERASED:
 		puts ("Flash not Erased\n");
 		break;
-	case ERR_PROTECTED:
+	case FL_ERR_PROTECTED:
 		puts ("Can't write to protected Flash sectors\n");
 		break;
-	case ERR_INVAL:
+	case FL_ERR_INVAL:
 		puts ("Outside available Flash\n");
 		break;
-	case ERR_ALIGN:
+	case FL_ERR_ALIGN:
 		puts ("Start and/or end address not on sector boundary\n");
 		break;
-	case ERR_UNKNOWN_FLASH_VENDOR:
+	case FL_ERR_UNKNOWN_FLASH_VENDOR:
 		puts ("Unknown Vendor of Flash\n");
 		break;
-	case ERR_UNKNOWN_FLASH_TYPE:
+	case FL_ERR_UNKNOWN_FLASH_TYPE:
 		puts ("Unknown Type of Flash\n");
 		break;
-	case ERR_PROG_ERROR:
+	case FL_ERR_PROG_ERROR:
 		puts ("General Flash Programming Error\n");
 		break;
-	case ERR_ABORTED:
+	case FL_ERR_ABORTED:
 		puts("Flash Programming Aborted\n");
 		break;
 	default: